Red Hat Bugzilla – Bug 859732
Quota calculation need to be explained
Last modified: 2014-03-25 03:21:20 EDT
Since quota calculation differs from the actual storage usege visable to the user, the quota calculation logic need to be explained.
From emails from Ofri and Gilad:
> > Here is what i think is missing:
> > ************************
> > Quota accounting:
> > After a quota was assigned to a costumer or a resource, each action
> > by that user or on that resource that involves storage, vcpu or
> > memory will result in quota consumption or quota release. For
> > example: when a user runs a VM with 1 vcpu and 1024MB memory – the
> > action will consume 1 vcpu and 1024MB of the quota assigned to that
> > user. When The VM will be stopped 1 vcpu and 1024MB will be
> > released
> > back to the quota assigned to that user (Note that Run-time Quota
> > consumption is accounted only during the actual run-time of the
> > consumer).
> > Since the quota acts as an upper bound which limits the user's
> > resources, the quota calculations may differ from the actual
> > current
> > use of the user. The quota is calculated for the max growth
> > potential and not the current usage. For example: if a user creates
> > a virtual thin provision disk of 10GB, the actual disk usage may
> > indicate only 3GB of that disk are actually in use. The quota
> > consumption, however, would be 10GB (The max growth potential of
> > that disk).
Added new topic to admin guide:
Quota Accounting 
Yes. And it should say virtual machine instead of VM.
I'll fix it now.
Moving to MODIFIED until I can stage it again.